Provided you connect to the correct type of LNB and configure your tuners correctly, testing at another place will prove the receiver is fine.
If it is fine at another location, then your faults will be one of the following:
F-plugs not fitted correctly
Damaged cable. Some damage may not be visible.
LNB faulty
Dish/LNB alignment issue
You will have to test one thing at time. Or pay someone to do it for you.